Alex Borstein, who was originally cast to play Sookie, has many appearances, including Drella, the Harp player at the Independence Inn; and Miss Celine, who is in the season 5 episode "Come Home". Boorstein is married to Jackson Douglas, who played Jackson Belleville on the show; during the run of the series, the characters of Sookie and Jackson eventually fell in love and got married.
In season 1, episode 5 ("Cinnamon's Wake"), Lane is found in Rory's room "skanking to Rancid". In season 4, episode 19 ("After Boom"), "Hep Alien" performs that same song at their gig.
The entire town of Stars Hollow is the Warner Bros Studios backlot set called "Midwest Street" built in 1946 for the film Saratoga Trunk (1945) (a small section usually unseen on the show - behind the church - was added in the early 1990's for no particular television or film project). The residential street attached is called Kings Row and was built in 1941 (predating the town set) for the Ronald Reagan film of the same name. No new structures have been added to the backlot for the "Gilmore Girls," although the backlot set remains dressed for the show throughout the television shooting season (July through March or April).
The mountain often seen on the show is actually Mount Hollywood.
Due to the fast pace speech in the show, the average script for an episode of the show runs 75-80 pages, as opposed to 45-50 for a standard hour-long television show. During the 101st episode, a black and white movie from the 1930s is being shown. Lorelai looks at the movie and says they "talked fast" in those movies.
When the character Brad Langford (Adam Wylie) returns to Chilton Academy after an absence of several months, he explains that he was away playing Jack in "Into the Woods" on Broadway. Wylie really was away from the series to play Jack in the 2002 Broadway revival of "Into the Woods".
Lane's boyfriend, Dave (Adam Brody), left the show after his first season. To explain his absence, Lane claims that he went to university in California. Brody left the show in order to play the part of Seth in The O.C., which takes place in California. Also, when Chad Michael Murray (playing Rory's Chilton classmate, Tristin Dugray) left the show, his absence was explained by the character being sent to military school in North Carolina, which is where Murray filmed his recurring role on "Dawson's Creek" and later "One Tree Hill".
Lane's father lives with Lane and her mother, but never appears in the show.
Sean Gunn, who plays Kirk, made his first appearance in episode 1.2 ("The Lorelais' First Day at Chilton"), but not as Kirk. His character was named "Mick" and he was installing a DSL server at the Lorelais' home that was ordered by Emily.
The exterior shot of "The Dragonfly Inn" is actually the home of TV's "The Waltons" (1971).
Liza Weil originally tested for the role of Rory and did not get the part, but the producers liked her so much that they wrote her the role of Paris Gellar.
The town of Stars Hollow is based on Washington Depot, Connecticut. Creator Amy Sherman stayed there while on a trip with her husband to look at Mark Twain's wallpaper.
The character of Lane Kim is based on Helen Pai, a co-producer of the show and the best friend of creator Amy Sherman.
Logan's very wealthy family runs a venerable publishing empire. Their last name, Huntzberger, is a reference to the Sulzberger family, who have owned The New York Times since Arthur Hays Sulzberger succeeded his father-in-law Adolph S. Ochs as publisher in 1935.
The exterior shots of the girls' home and the foyer and hallway are all filmed on the outdoor set, while nearly all of the interior house scenes are filmed across the studio front lot in a sound stage, where the entire first floor of the home is built to scale.
Scott Patterson, who plays Luke, was not originally hired to be a series regular. He was only signed on for the pilot episode, but it was only after the discovery of the undeniable chemistry between him and Lauren Graham that he was contracted for more episodes, and quickly became a series regular.
Lorelai's dog is named Paul Anka, after the 60's rock and roll artist.
Alexis Bledel can not stand coffee, but Rory her character loves it. Her coffee cup is filled with coke .
In the episode, "Lorelai's Graduation Day", we discover that Lorelai's middle name is Victoria. Rory's given first name is also Lorelai, but her middle name is Leigh. "Lorelei Lee" is the name of a main character in "Gentleman Prefer Blondes" (played by Carol Channing in the original Broadway production and by Marilyn Monroe in the movie version).
Lane's band's name is "Hep Alien". The writers named it after producer Helen Pai; "Hep Alien" is an anagram of her name.
After the sixth season, the show was picked up by The CW because The WB merged with UPN to form The CW.
The character of Jess (played by Milo Ventimiglia) was supposed to have a spin-off called "Windward Circle" which was picked up by the WB for midseason 2004, in which the character moves in with his estranged father (played by Rob Estes) and his girlfriend (played by Sherilyn Fenn) from Connecticut to California. But due to the high cost of filming on location in Venice, California, the WB changed their minds and decided not to go forward with it.
Sherilyn Fenn was to have starred alongside Milo Ventimiglia and Rob Estes in the California-set spin-off "Windward Circle". After The WB dropped the project, "Gilmore Girls" creator Amy Sherman wanted to work with Fenn again and wrote the character of Anna Nardini with Fenn in mind, in order to bring her back in the series. The character of Anna was originally to have a strong enough presence to be a potential threat to the character of Lorelai. However, after Sherman left the show, the producers changed the direction originally intended for the character, as they decided to make her a villain in a custody battle.
In the season 5 opener "Say Goodbye to Daisy Miller", when Luke is leaving Lorelai messages on her answering machine, he states his phone number is (860) 294-1986. This number was used as a bid for donations toward the new Children's and Maternal Hospital at Hopkins to which the number belongs. Luke is played by Children's Center Director George Dover's brother-in-law, Scott Patterson.
SPOILER: At the end of season 5 after Rory steals a yacht, Lorelai says that Rory's court date is June 3rd. That is the same day Lorelai sets as her wedding date to Luke later in season 6.
Milo Ventimiglia was originally supposed to make only a few guest appearances as Jess, Luke's nephew. The producers liked him so much they offered him a 6 season contract as a series regular. He asked to be signed for only 2 years.
The exterior "Midwest" sets, which incorporate Stars Hollows' town square, the Gazebo, Luke's Diner and Doosey's Market, are also featured prominently in The Dukes of Hazzard. They can also be seen in a scene in the original theatrical version of The Music Man. There are several subtle references to this fact, including in season 7, Rory's friend referring to Stars Hallow as the perfect small town where "you expect Harry Hill to come to town and con people into buying band instruments" and in season 1, episode 14 in Luke's when Taylor says, "We've got trouble my friends," to which Lorelai responds with, "Right here in River City."
Luke's character was originally written to be played by a woman, but the producers figured that "there wasn't enough testosterone" in the series and that resulted in Scott Patterson turning the character around.